Variation Field Map and Intraclass correlation (ICC)


ICC models in Linear Mixed Model (LMM)


Theoretical Variation Field Map (3D)

  • x-axis: within-individual variation
  • y-axis: between-individual variation
  • z-axis: ICC (intraclass correlation), ICC=y/(x+y)

Theoretical Individual Variation Field (2D)

  • x-axis: within-individual variation
  • y-axis: between-individual variation

ICC colormap:


Example (Demo data provided in “Calculat Your Data”):

Measuring ICC and individual difference of cortical functional connectivity (seed: posterior cingulate cortex)

 

Individual variation and ICC field map: Each dot represents a brain region. Regions with higher ICC have relatively higher between-individual variation and lower within-individual variation.

 

ICC map on the cortex